Page 37 - Training 2019

THE RIGHT END SEALS WILL PREVENT LEAKS IN YOUR SYSTEM:

Problems that result from failed End Seals:

 Chamber leaks
 Poor ink and coating transfer
 Excessive doctor blade wear
 Premature anilox roller wear and scoring
 Press downtime

Why Chamber Leaks Occur:

While there are other causes of chamber leaks, failed end seals are
responsible for the lion’s share. It is important to:

 Use an end seal material that is compatible with the type of ink or
coating being used
 Use the correct profile for the chamber
 Consider the length of the run
 The press speed.

Good seal design for a proper fit is very critical to ensure that end seals
contain ink or coating within the confines of the chamber. Incorrect end
seal size and shape will leave gaps for ink or coating to leak out of the ends.
If the seals aren’t sufficiently lubricated, the increased friction against the
anilox roller will cause ink or coating build-up and leaking.

When a chamber is leaking, the press operator will often try to fix the
problem by increasing the load pressure instead of looking for the cause of
the leak. End seal leaks should never be resolved by increasing chamber
pressure. The additional pressure increases friction between the doctor
blade and the anilox roll and causes both to wear prematurely. Paying a
little extra attention when installing doctor blades and end seals can
prevent many leaks from occurring in the first place.

Check your ends seals for the proper radius:

The radius profile of the end seal is critical as this will require far too
much pressure to prevent leaks and then the doctor blade will not wipe
properly. See two extreme bad examples.

CHAMBER BLADE END SEALS TRAINING MANUAL 3
Updated - 24 June 2019